(19)

(11)

EP 0 403 497 A1

(12)

(43) Date of publication: 27.12.1990 Bulletin 1990/52 (21) Application number: 89902391.0 (22) Date of filing: 16.02.1989

(51) International Patent Classification (IPC):  G01B 21/ 20( . ) G01B 11/ 00( . ) (86) International application number: PCT/FI1989/000028 (87) International publication number: WO 1989/007749 (24.08.1989 Gazette 1989/20)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 17.02.1988 FI 19880000736 (71) Applicant: VISION-SYSTEMS OY SF-40320 Jyväskylä (FI)	(72) Inventor: REPONEN, Jorma SF-41310 Leppävesi (FI) (74) Representative: Solf, Alexander, Dr.  Patentanwälte Dr. Solf & Zapf Candidplatz 15 D-81543 München D-81543 München (DE)